Free Online Tools for Modrinth Modpacks

A small collection of browser-based utilities for working with .mrpack files and standard .zip modpacks. Every tool runs entirely client-side — nothing is uploaded.

MRPack to ZIP Converter

Our flagship tool. Convert any Modrinth .mrpack into a standard ZIP that works in CurseForge, MultiMC, Prism, ATLauncher, the vanilla launcher and server hosts.

ZIP to MRPack Converter

The reverse direction. Useful for modpack authors preparing to publish on Modrinth — turn a working ZIP into a clean .mrpack with auto-generated manifest.

MRPack Validator

Check a .mrpack for spec compliance, broken URLs, hash mismatches and missing required fields before you publish or share it.

MRPack Inspector

Open a .mrpack and browse its contents — manifest fields, mod list, file sizes, dependencies — without extracting anything to disk.

Why browser-based?

Every tool here is implemented as static HTML plus JavaScript. There is no server-side processing, no account, no upload queue. Your files stay on your device. The trade-off is that very large modpacks (200+ mods, multi-GB) are slower on mobile devices — for those, prefer a desktop browser with a stable connection.